I have not quite clear how much the processor can support as a maximum of Mhz, I can use all the 3200Mhz or with Ryzen 5 I have a maximum threshold? Am I using all the Mhz RAM available or am I "limited" by a maximum threshold?

For example, upgrading the BIOS can be made to support more than now Mhz?

Is that exact RAM model on your motherboard's QVL list for 3200mhz? Also, is it version 4 or 5, because version 4 is Samsung and version 5 is Hynix, the former has better compatibility than the latter.